Rexroth A7VO80 Bent-Axis Variable Displacement Hydraulic Pump

Most variable displacement pumps use a swashplate to push pistons. The A7VO80 uses a bentaxis principle: the cylinder block angles away from the drive shaft. This small geometric shift delivers massive advantages.

Higher Pressure at Lower Input Speeds

Because the pistons move more naturally with the rotating group, the A7VO80 maintains stable output even below 500 RPM. For operators using PTOdriven equipment on idle diesel engines, this means usable hydraulic power without revving up.

Superior Suction Performance

The bentaxis design creates a more direct fluid path into the piston bores. The result? The A7VO80 can handle inlet vacuum down to 0.4 bar absolute without cavitation damage. This is critical for cold starts or when the tank is poorly positioned.

Key Technical Parameters of the A7VO80

Before specifying this pump, lock in these baseline figures:

Displacement: 80 cm³/rev (variable, zero to max)

Maximum pressure: 400 bar (peak) / 350 bar continuous

Speed range: Up to 3000 RPM (depending on control type)

Direction of rotation: Bidirectional (standard)

Weight: Approx. 40 kg (dry)

Control Systems You Can Actually Use

Rexroth offers modular controls. Here are the three most common for the A7VO80.

1.DA Control (SpeedSensitive)

No electric wires. No proportional valves. The pump output is directly proportional to input shaft speed. Perfect for winches and travel drives on wheel loaders.

2.EP Control (Electric Proportional)

Use a 4–20 mA or 0–10 V signal to vary displacement. This is your choice for precision mixing drums or conveyor drives where rampup must be smooth.

3.HW Control (Hydraulic Manual)

A simple hydraulic pilot pressure shifts the yoke. Reliable for basic openloop systems like agricultural spreaders.

Common Failure Modes (And How to Avoid Them)

Even a robust pump has weak points. Here’s what kills the A7VO80.

Contaminated Case Drain

The bentaxis design circulates case drain oil for lubrication. If your return filter bypasses, debris scores the piston slippers. Fix: Install a 10µm absolute filter on the case drain line—not just the main return.

Misadjusted Mechanical Stop

The displacement limiter screw comes preset. Turning it to “get more flow” usually overstrokes the rotating group, leading to timing plate gallium. Fix: Never adjust the maxvolume stop without a flow meter and pressure gauge.

Aeration Whine

If you hear a highpitched crackling sound, it’s not normal. The A7VO80’s suction port needs positive head pressure (minimum 0.8 bar absolute). Fix: Raise the tank or add a charge pump.

Installation Best Practices for Longevity

Mounting this pump isn’t like bolting on a gear pump.

1.Flexible coupling alignment: Angular misalignment above 0.5° will destroy the shaft seal within 200 hours. Use a laser alignment tool.

2.Housing drain: Always run a separate case drain line to the tank, above oil level. Daisychaining drains with other components causes backpressure >2 bar, which lifts the shaft seal.

3.Startup filling: Fill the pump housing via the top port before first start. Running it dry for even 10 seconds scores the bronze timing plate.

Specifications

Selection Table

Q1:My A7VO80 leaks from the shaft seal after 300 hours. Bad pump?

A1:Unlikely. Check your case drain pressure. Above 2 bar, the seal extrudes. Install a larger drain line or add a backpressure valve on the tank return.

Q2:Is the A7VO80 rebuildable onsite?

A2:Partially. You can replace seals, control valve, and shaft bearing. But the piston/cylinder block matching requires a lapping jig.

Q3:How to purchase an A7VO80 hydraulic pump?

A3:You can click on the right sidebar or the contact information in the top bar to contact us to purchase. You can do so via email, form, WeChat, WhatsApp, or other methods.

Q4:What is the price and delivery time of the A7VO80 hydraulic pump?

A4:The specific price and delivery time will be provided based on the specific model you provide.